Door lock



March 15, 1949.

Filed Sept. 26, 1946 S. OXHANDLER DOOR LOCK 2 Sheets-Sheet l PatentedMar. 15, 1949 DOOR LOCK Samuel Oxhandler, Flushing, N. Y., assignor toSargent & Company, NewHaven, Conn., a corporation of ConnecticutApplication September 26, 1946, Serial No. 699,480

2 Claims. (01. 70-150) This invention relates to door locks, and moreparticularly to safety devices for door locks, so that the lock may notbe forced and the door opened by an unauthorized person.

In door locks which are provided with a latch bolt rather than a deadbolt, it has been more vor less customary to provide a so-called guardbolt which is forced inwardly or retracted by con- .tact with the strikeplate of the door and usually With such an arrangement, when the latchbolt is dogged against retraction by the outside knob and when the boltis also dogged by theaction of the guard bolt (explained immediatelyabove) against retraction by the insertion of a tool between the doorand jamb, the door may not usually be forced by an unauthorized personso long as the outside knob cannot be removed. There are, however, twoways in which such a lock may be forced, and it is the object of thepresent in vention to prevent the forcing of the lock in either of thesetwo ways, as will now be explained.

. The latch is usually dogged against retraction from the outside by aknob-dogging device which often comprises a lever or push buttonsaccessible at the face plate of the lock when the door is open. When thedoor is closed, this face plate stands against the strike plate, and ithas often been assumed that in such case the dogging mechanism cannot beactuated when the door is closed.

.However, it sometimes occurs that an unauthorized person may insert atool between the door and door jamb and operate the dogging plungers ordogging lever in a manner similar to that em;- ployed to force back thelatch bolt. When this dogging mechanism is actuated, the outside'knob isno longer dogged and anyone may freely enter.

"I contemplate by the present invention, therefore, to provide such aconstruction thaa-when .the door is closed with the dogging mechanismset to dog the outside knob, this-dogging mecha- "50 nism is itself heldor dogged against movement so that it cannot be moved to inoperativeposition to release the outside knob by a tool inserted between the doorand door jamb. I

. ,.It also sometimes occurs that the outside knob is broken or removedfrom its shank, thus permitting an unauthorized person to insert a toolthrough the hollow shank or sleeve and manipu late the latch bolt fromthe outside just as he would from the inside. That is, although theouter knob is dogged the inner knob is not dogged, and if the outer knobis removed it is a relatively simple matter to operate or retract thelatch bolt from the outside, Alternatively, when the outer knob isprovided with a key-operated lock, which also may operate the latchbolt, the knob may sometimes be fractured or broken to permit it torotate upon its shank, and as this is equivalent to the rotation of thekey barrel the latch may, in that event, be operated by the rotation ofthe knob even though the shank of the knob is still dogged. Therefore, Ialso contemplate by the present invention to construct the knob in sucha manner that if a wrench or other tool is applied thereto a frangiblepin or securing member will be broken and will permit the knob to rotatefreely upon the shank, but such action will not result in the rotationof the key-operated lock or spindle operated thereby, and as the knobwill rotate freely upon its shank no further damage can be done theretoby the tool.

One object of the present invention, therefore, is to provide a doorlock with a latch bolt and a guard bolt and knob-dogging mechanism, theconstruction being such that the retraction of the guard bolt will alsoprevent actuation of the knobdogging mechanism when the latter is inoperative position.

A still further object of the invention is to provide a door lock withmechanism accessible through the face plate of the lock for dogging theouter knob, and with guard bolt mechanism arranged when the guard boltis retracted by the strike plate to both prevent retraction of the latchbolt and prevent-actuation of the dogging mechanism if the latter is inoperative position.

Still another. object of the invention is to pro- ,vide a knob structurefor a door lock such that the knob may not be removed by the applicationof a wrench or other rotative force at the outside of the door. I

Still another object of the invention is to providea lock havingmechanism to dog the outer knob with an outer knob construction suchthat the application of a turning force to the outer knob by a wrench orother tool will merely result in the fracture of a frangible elementwhich will permit the knob to turn idly upon its shank while it is stillheld upon the shank.

To theseand other ends the invention consists in the novel features andcombinations of parts to be hereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a sectional view through a door having my lock appliedthereto, the lock mechanism being shown in top plan view;

Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1;

Fig. 3 is a sectional view on line 33 of Fig. 2;

Fig. 4 is a fragmentary sectional view similar to Fig. 2, but showingthe parts in another position;

Fig. 5 is a sectional view on line 5-45 of Fig. 2;

Fig. 6 is a plan view of the door knob and shank detached from the lock;and

Fig. 7 is a sectional view on line 'I-'I of Fig. 6.

To illustrate a preferred embodiment of my invention, I have shown inthe drawings a door I0 having a lock applied thereto consisting of acase portion II, a cover 52, and a face plate I3.

A latch bolt 94 is slidably mounted in the case, this latch beingprovided with a retracting yoke having laterally turned end portions II3 adapted to be engaged by any one of the three hubs or rollbacks I8, I9 and 29. The rollback 2G is operated by an inside knob (not shown) inthe usual manner, and no further description thereof is necessary.

The rollback i8 is operated by the outside knob 2|, which knob ismounted upon the shank 22 in a manner which will be hereinafterdescribed, which shank is provided with a reduced noncircular endportion 23 adapted to fit within the hub of the rollback. The rollbackI9 is operated by the square spindle 25 attached to the key barrel of acylinder lock 26 mounted in the outside knob.

As shown more particularly in Fig. 2, the outside rollback I8 is adaptedto be dogged against operation by a dogging slide 28, to which slide isconnected a pin 29 adapted to be received in a recess 3G in the hub ofthe rollback. The slide .28 is connected to a plunger 3i (Fig. l)accessible for operation through an opening in the face plate I3, thisplunger being connected to a companion plunger 32 also accessiblethrough the face plate I3 by a walking beam 33 pivoted in the case at34. The arrangement is such that when one of the plungers is movedinwardly, the other is moved outwardly, so that the dogging slide may beoperated in either direction, depending upcn which of the plungers isactuated by pressure of the finger thereon. Inward pressure upon theplunger 3| to move it to the left, as shown in Figs. 1' and 2, will movethe dogging slide inwardly and project the pin 29 in the recess 3G todog the outside knob against operation.

Also slidably mounted in the lock case is a guard bolt 36 which guardbolt carries a tail or crosshead 31 having a laterally disposed finger33 adapted to engage a shoulder 39 upon a dogging lever {it"pivo'tallymounted in the case at 4|, this dogging lever having a nose 42 adaptedto engage rearwardly of the latch bolt and prevent the retraction of thelatter. As shown in Fig. 4, the guard bolt is urged to projectedposition by a spring 43, while the dogging lever Ml is urged in acounterclockwise direction by a spring t l.

The above parts are of usual construction and, according to the usualpractice, when the door stands open the guard bolt will be projectedasshown in Fig.2, and the'finger 38 on the tail of the guard bolt willengage the'shoulder 39 of the dogging lever All and hold it in itsinoperative position against the pressure of spring 44. However, whenthe door is closed, the guard bolt will be retracted by the strike plateon the door jamb and the finger 38 will be moved away from the shoulder39, thus permitting the spring 44 to throw the dogging lever 40 to theposition shown in Fig. 4 in which its nose 42 stands behind the latchbolt and prevents retraction of the latter.

A lever 45 is pivoted to the cover I2 of the case at 56, this lever, asshown in Fig. 2, normally being held in a forward position by theengagement therewith of the tail 3'! of the guard bolt when the door isopen and the guard bolt protracted. This lever is provided adjacent itsupper end with a laterally projecting arm 41 which, in this position ofthe parts, normally stands above the'walking be'am33 so as not tointerfere with the action of this walking beam or the plungers 3I and32. A spring 48 urges the lever 45 in a. clockwise direction.

When the door is closed and the guard bolt moved to the position shownin Fig. fl, the tail portion 37 of the guard bolt will bemoved'rearwardly out of engagement with the lever 45 ;t permitting thespring 48 to move this ever slightly in a clockwise direction, thusthrowing the arm 4'! downwardly 'to a positionto engage the walking beam'33 and, by preventing its movement, also preventing movement of theplunger 32. Y v

Therefore, it will be seen that when the door is closed and the guardbolt retracted by the strike plate, not only will the bolt M be doggedagainst retraction by the lever 40, but also, if the outside knob isdogged against operation by inward movement of the plunger 3I, thewalking'beam 33 will be restrained from movement, so that the plunger 3Imay not be moved outwardly to release the outside knob. Therefore," anunauthorized person cannot, by the insertion of a tool between the doorand jamb, force the plunger 32 inwardly and the plunger 3I outwardly andthus release the outside knob.

As stated above, I have also provided mechanism for preventingreinova'lof the outside knob from the door, which will now be explained.knob shank 22 is rotatably mounted in a sleeve 58 secured to theescutcheon 5|, and a split ring 52 is engaged in an annular recess inthe shank to prevent removal'of the shank from the sleeve.

This shank is hollow and is provided adjacent its outer end with'anenlarged portion 53, there being a shoulder 54 between this enlarged endand the body of the shank. A sleeve 55 is freely mounted upon the shank,this sleeve having external threads 56 to receive the threads 56provided internally upon the knob 2I, so that'the knob may be threadedupon the sleeve 55.

This sleeve is provided with a plurality of re cesses 51 (Figs. 6 and'7) adjacent its inner edge, and after the knob has been threaded uponthe sleeve a pin 58, is driven through one of the recesses 57 intoregistering semi cir'cular' recesses 59 in the sleeve and the knob, thuspreventing relative rotation of the knob and sleeve so that the knob maynot be unscrewed.

As the sleeve 55 is rotatably mounted on the shank, the knob which issecured to the sleeve, as described above, would also be rotatable uponthe shank. In order'tfo secure theknob rigidly'to the shank 22 a pin 68(Figsf3 and '7) is driven into the shank'through one of the recessest'flftlie head 'of'the pin standing in this recess so that the sleeve 55may not be rotated onthesharik. The knob is now rigidly secured to theshank as the sleeve 55 can neither rotate thereon or move longitudinallythereof, it being restrained against longitudinal movement by theshoulder 54 and pin 60.

The pin 60 is so constructed that it is more easily fractured than thepin 58, so that if an unauthorized person applies a strong rotativeforce to the door knob when the latter is dogged as by a wrench orsimilar tool, the pin 60- will be fractured before the pin 58 or otherparts-"give way. Fracture of the pin 60 will permit the sleeve 55 andknob secured thereto to rotate freely upon the hollow shank 22, but theknob and sleeve will, of course, be prevented from removal from theshank by the shoulder 54. No further rotative force can now beeffectively applied to the knob, and it will be impossible for anunauthorized person to gain entrance to the door by this method.

When the pin 50 has been fractured, it iszonly necessary to remove theknob assembly from the door, and after removal of the split ring 52 fromthe shank 22 the latter may be drawn out of the sleeve 55 and the brokenpin 60 replaced with a new one. The only damage which will have beendone to the lock by the attempt at burglarly will be the fracture of thepin 60 which may be readily replaced as described.

As indicated in Fig. 6 of the drawings, the lock mounted within the knob21 is telescoped within the end of the shank 22 and held againstrotation with respect to this shank. Therefore, rotation of the knobupon the shank after the pin 60 has been fractured does not result inrotation of the spindle 25. 1

While I have shown and described some preferred embodiments of myinvention, it will be understood that it is not to be limited to all ofthe details shown, but is capable of modification and variation withinthe spirit of the invention and within the scope of the claims.

What I claim is:

l. A door lock comprising a case having a face plate, a boltreciprocably mounted in the case,

actuating means for the bolt including a knob, knob-dogging mechanismhaving actuating means, a part of which projects through the face plate,a retractable guard bolt projecting through the face plate, a leverpivoted in the case and controlled by said guard bolt for dogging saidfirst-named bolt, and a member movably mounted in the case andcontrolleddn position by said guard bolt, said member being adapted todog said actuating means when said guard bolt is retracted, said membercomprising a. second lever pivoted in the case and having a portionengaged by a part of the guard bolt and another portion adapted toengage the actuating means.

2. A door lock comprising'a case having a face plate, a boltreciprocably mounted in the case, actuating means for the bolt includinga knob, knob-dogging mechanism having actuating. means, a part of whichprojects through the face plate, a retractable guard bolt projectingthrough the face plate, a lever pivoted in the case and controlled bysaid guard bolt for dogging said first-named bolt, a member movablymounted in the case and controlled in position by said guard bolt, saidmember being adapted to dog said actuating means when said guard bolt isretracted, said member comprising a second lever pivoted in the case,and each of said levers having a portion engaged by a part of the guardbolt when the latter is protracted to hold them in inoperative position.

SAMUEL OXHANDLER.

REFERENCES CITED The following referencesare of record in the iile ofthis patent:

UNITED STATES PATENTS Number Name Date 938,444 Voight Oct. 26, 19091,171,264 Shaw Feb. 8, 1916 1,744,957 Fox Jan. 28, 1930

